Pittsburgh police said a man drove with his five children to the Mount Washington home of the kids' mother -- his ex-girlfriend -- and ended up shooting another man who has been dating the woman.

"I saw two people running down the alley, and the guy pulled out a gun and shot him once," a witness told Channel 4 Action News.

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Officers responded to the call about gunshots on Eureka Street and found the 23-year-old victim with a chest wound shortly before 9:20 p.m. Tuesday.

Narcotics and vice detectives in the area of Haberman Street spotted a car matching the description from a witness. They saw the driver and a passenger get out and switch positions and drive away, police said.

Detectives pulled the car over at the intersection of Saw Mill Run Boulevard and Crane Avenue, and they arrested Kenneth Lambert, who police said was identified by a witness as the shooter.

Lambert was in the car with his new girlfriend, according to police.

"The investigation revealed that Mr. Lambert shot the victim because he was in a relationship with his former girlfriend. The victim is expected to survive his injuries," police said in a written statement.